J. Anim Sci.
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J. Anim Sci. 1976. 42:736-744.
© 1976 American Society of Animal Science
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Nutrient Accumulation and Prediction of Body Composition of 20-Week-Old Calves Fed Varying Percentages of Protein and Fiber1

E. Jahn2, P. T. Chandler and R. F. Kelly3

Virginia Polytechnic Institute and State University,4, Blacksburg 24061

Abstract

Four crude protein (CP) (9.0, 11.5, 14.5 and 17.5%) and three acid detergent fiber (ADF) (11, 18 and 25%) percentages were evaluated in a complete factorial experiment. Five calves were randomly assigned to an experimental ration at 8 weeks of age and fed ad libitum during two consecutive 6-week periods. Live weights and feed intakes were determined weekly. Male calves were slaughtered at 20 weeks of age and total body composition determined. Four comparable males were slaughtered at 8 weeks of age serving as an initial slaughter group.

Digestive tract contents (fill) increased linearly with increasing fiber and decreased with added protein.

Composition of fat-free tissue was nearly constant. An equation, containing percent fat of the 13th rib and kilograms kidney fat, predicted ether extract of empty body with an R of .90. Carcass specific gravity and percent fat of 9-10-11th rib were not good predictors of body fat.

Efficiency of transformation of ration protein to tissue protein was 33.8, 31.7 and 25.4 for 11, 18 and 25% ADF rations.

Footnotes

1 Published with the approval of the director of the Division of Animal and Veterinary Science, Virginia Polytechnic Institute and State University, Blacksburg.

2 Present address: Animal Science Research, Merck and Co., Inc., Rahway, NJ 07065.

3 Department of Food Science and Technology.

4 Department of Dairy Science.






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Copyright © 1976 by the American Society of Animal Science.